Volks,
The wiring harness is fine, and there's continuity everyplace I need it.
Except on the glass.
Sadly, closer inspection tells me it isn't just a few damaged places on the
window grid. Rather, it's essentially the entire grid that is missing.
Only the brown substrate is there -- there is literally no conductive stuff
on 99% of it. Well -- maybe 1"-2" on the entire grid. And a little bit
near the connector terminals on either side. If I'm ever going to defrost,
it will mean an entire new rear window.
Ain't this a fun hobby?
Bert Knupp in Music City USA
|__n__
(_____)º
(Ô\_|_/Ô)
ü ° ° ü
Polizeikäfer '70
-----Original Message-----
From: vintagvw-boun...@lists.sjsu.edu
[mailto:vintagvw-boun...@lists.sjsu.edu] On Behalf Of Sharkeys Garage
Sent: Wednesday, October 21, 2009 10:44 PM
To: 'Air-Cooled Volkswagen Discussion List'
Subject: Re: [vintagvw] Rear window defroster wiring
If the entire grid isn't working, it's obviously a problem somewhere between
the grid itself and the car's wiring harness. If portions of the grid
aren't working, it's usually due to a break in one or more runs (usually
caused by scratching the glass while cleaning it or storing something on the
rear parcel shelf). Simple enough to fix... just warm up the glass with a
hair dryer, apply Scotch tape to either side of the grid line where the
break is, and apply the copper paste compound. Remove tape when fully dry
and test.
-----Original Message-----
From: vintagvw-boun...@lists.sjsu.edu
[mailto:vintagvw-boun...@lists.sjsu.edu] On Behalf Of Randy Ferrill
Sent: October-21-09 7:38 AM
To: Air-Cooled Volkswagen Discussion List
Subject: Re: [vintagvw] Rear window defroster wiring
I would think that if it was not an open circuit, that would be my first
test. Does the wiring (paint) lose resistance over time?
Bert Knupp wrote:
Mike,
You're right. I found an old German manual showing a photo of the
metal-can
relay under the left end of the rear seat. It's a continuous-duty relay
(like headlights use) with an 8-amp continuous capacity to carry the high
wattage that the window defroster draws.
And to those of you who sent tips about repairing damaged grid wires:
Thanks for the tips. I suspect that comes next! Does anybody know the
correct resistive load that the rear window defroster is supposed to
provide? That way I can test it before the snow comes.
Thanks,
Bert
|__n__
(_____)?
(È\_|_/È)
³ ? ? ³
Polizeikõfer '70
-----Original Message-----
From: vintagvw-boun...@lists.sjsu.edu
[mailto:vintagvw-boun...@lists.sjsu.edu] On Behalf Of Mike
Sent: Saturday, October 17, 2009 5:52 PM
To: Air-Cooled Volkswagen Discussion List
Subject: Re: [vintagvw] Rear window defroster wiring
I believe that relay was originally located under the rear seat.
----- Original Message -----
From: Bert Knupp
To: 'Air-Cooled Volkswagen Discussion List'
Sent: Saturday, October 17, 2009 6:00 PM
Subject: [vintagvw] Rear window defroster wiring
Volks,
The previous owner of my '70- beetle disconnected the rear defroster,
leaving a black wire in black spaghetti tubing dangling under the car,
and
no visible connection up front at the fuse box. The little toggle
switch
is
under the dash, and it seems to be okay, though not connected to
anything.
I'm guessing it's a grounding switch for a relay.
Who knows the correct factory routing for this wiring circuit? My
schematic
shows a relay, though none is present up front in my car. I'll assume
it
draws coil power from a #15/54 circuit somewhere.
What's the correct original wiring and routing for the rear-window
defroster? I'm guessing I'll need to thread a new front-to-back wire
(1.5
mm?) parallel to the main harness. I need to figure out where my orphan
black wire comes from -- and goes to. Do I pull #30 power from my
voltage
regulator's battery terminal?
The printed wire grid on the glass passes cursory visual inspection --
no
obvious breaks -- but I haven't put a meter to it yet. Does anybody
know
what the proper (disconnected) resistance for it ought to be?
You can send me stuff off-list at bert.kn...@comcast.net, if you'd like.
Bert Knupp
|__n__
(_____)?
(È\_|_/È)
³ ? ? ³
Polizeikõfer '70
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